Final answer:
The sentence 'Tio Pepe invitas a todos a la fiesta' is incorrect because the verb should be 'invita' instead of 'invitas' to agree with the subject.
Step-by-step explanation:
The sentence Tio Pepe invitas a todos a la fiesta is incorrect. The subject of the sentence is Tio Pepe, which is a third-person singular noun. Therefore, the correct form of the verb should be invita instead of invitas.
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